City have been self financing for three seasons - I can't see that changing even with Qatar throwing money around like confetee. Indeed it wouldn't surprise me if Saudi and UAE v Qatar kicks off seriously in the very near future. Rumour has it that Trump stopped a Saudi invasion earlier this year.
As to the storage of electricity, Lthium-Ion batteries are not the technology to invest in. Micro Super-Capacitors are the tech that will be used going forward. With a much greater energy storage density, higher thermal stability, a much faster charge rate, and long lasting (much reduced recycling costs especially to the environment) these will replace Lithium-Ion Battery tech within 6 years. Various teams across the world are working on this tech across the world and priduction versions will be available within 2 years. The following article is based on the Canadian/French teams version:
https://www.google.co.uk/amp/s/phys...o-supercapacitor-unmatched-energy-storage.amp